package info.erge.dataStructure;

public class Array<E> {
    private E[] data;
    private int size;

    @SuppressWarnings("unchecked")
    public Array(int capacity) {
        data = (E[]) new Object[capacity];
        size= 0;
    }

    public Array() {
        this(10);
    }

    public int getSize() {
        return size;
    }

    public int getCapacity() {
        return data.length;
    }

    public boolean isEmpty() {
        return size == 0;
    }

    public void addLast(E e) {
        // if (size == data.length) {
        //     throw new IllegalArgumentException("add last fail");
        // }
        // data[size] = e;
        // size++;
        add(size, e);
    }

    public void addFirst(E e) {
        add(0, e);
    }

    public void add(int index, E e) {
        // if (size == data.length) {
        //     throw new IllegalArgumentException("add fail");
        // }
        if (index < 0 || index > size) {
            throw new IllegalArgumentException("add fail");
        }
        if (size == data.length) {
            resize(2 * data.length);
        }
        for (int i = size - 1; i >= index; i--) {
            data[i + 1] = data[i];
        }
        data[index] = e;
        size++;
    }

    @SuppressWarnings("unchecked")
    private void resize(int newCapacity) {
        E[] newData = (E[]) new Object[newCapacity];
        for (int i = 0; i < size; i++) {
            newData[i] = data[i];
        }
        data = newData;
        newData = null;
    }

    public E get(int index) {
        if (index < 0 || index > size) {
            throw new IllegalArgumentException("get fail");
        }
        return data[index];
    }

    public void set(int index, E e) {
        if (index < 0 || index > size) {
            throw new IllegalArgumentException("set fail");
        }
        data[index] = e;
    }

    public boolean contains(E e) {
        for (int i = 0; i < size; i++) {
            if (data[i].equals(e)) {
                return true;
            }
        }
        return false;
    }

    public int find(E e) {
        for (int i = 0; i < size; i++) {
            if (data[i].equals(e)) {
                return i;
            }
        }
        return -1;
    }

    public E remove(int index) {
        if (index < 0 || index > size) {
            throw new IllegalArgumentException("set fail");
        }
        E ret = data[index];
        for (int i = index + 1; i < size; i++) {
            data[i - 1] = data[i];
        }
        size--;
        data[size] = null;
        if (size == data.length / 2) {
            resize(data.length / 2);
        }
        return ret;
    }

    public E removeFirst() {
        return remove(0);
    }

    public E removeLast() {
        return remove(size - 1);
    }

    public void removeElement(E e) {
        int index = find(e);
        if (index != -1) {
            remove(index);
        }
    }

    @Override
    public String toString() {
        StringBuilder res = new StringBuilder();
        res.append(String.format("size = %d, capacity = %d\n", size, data.length));
        res.append("[");
        for (int i = 0; i < size; i++) {
            res.append(data[i]);
            if (i != size - 1) {
                res.append(" ");
            }
        }
        res.append("]");
        return res.toString();
    }

    public static void main(String[] args) {
        // Array<Integer> arr = new Array<Integer>(20);
        // Array<Integer> arr = new Array<Integer>();
        // for (int i = 0; i < 10; i++) {
        //     arr.addLast(i);
        // }
        // System.out.println(arr);
        // arr.add(1, 100);
        // System.out.println(arr);
        // arr.addFirst(-1);
        // System.out.println(arr);
        // arr.remove(2);
        // System.out.println(arr);
        // arr.removeElement(4);
        // System.out.println(arr);
        // arr.removeFirst();
        // System.out.println(arr);
        // arr.removeLast();
        // System.out.println(arr);
        Array<Student> arr = new Array<>();
        arr.addLast(new Student("daerge", 18));
        arr.addLast(new Student("erge", 15));
        System.out.println(arr);
    }
}
